"Dagnasty" is a slang word used to express anger or frustration. It is a combination of "dang" and "nasty", and is often used as a milder substitute for more offensive language. However, there are numerous synonyms that can be used in place of "dagnasty" that may be more appropriate for certain situations. Some possible alternatives include "foul", "disgusting", "repulsive", "vile", "obscene", and "distasteful". Using these words instead of "dagnasty" may help to convey a stronger sense of disgust or revulsion, or to avoid sounding overly informal or vulgar in more formal settings.